1 /*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 #if 0 36 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD$"; 40 #endif /* not lint */ 41 42 #include <sys/param.h> 43 #include <sys/stat.h> 44 #include <sys/time.h> 45 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 46 #include <sys/mman.h> 47 #endif 48 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <fts.h> 53 #include <limits.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <sysexits.h> 57 #include <unistd.h> 58 59 #include "extern.h" 60 61 int 62 copy_file(FTSENT *entp, int dne) 63 { 64 static char buf[MAXBSIZE]; 65 struct stat *fs; 66 int ch, checkch, from_fd, rcount, rval, to_fd, wcount, wresid; 67 char *bufp; 68 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 69 char *p; 70 #endif 71 72 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 73 warn("%s", entp->fts_path); 74 return (1); 75 } 76 77 fs = entp->fts_statp; 78 79 /* 80 * If the file exists and we're interactive, verify with the user. 81 * If the file DNE, set the mode to be the from file, minus setuid 82 * bits, modified by the umask; arguably wrong, but it makes copying 83 * executables work right and it's been that way forever. (The 84 * other choice is 666 or'ed with the execute bits on the from file 85 * modified by the umask.) 86 */ 87 if (!dne) { 88 #define YESNO "(y/n [n]) " 89 if (iflag) { 90 (void)fprintf(stderr, "overwrite %s? %s", 91 to.p_path, YESNO); 92 checkch = ch = getchar(); 93 while (ch != '\n' && ch != EOF) 94 ch = getchar(); 95 if (checkch != 'y' && checkch != 'Y') { 96 (void)close(from_fd); 97 (void)fprintf(stderr, "not overwritten\n"); 98 return (1); 99 } 100 } 101 102 if (fflag) { 103 /* remove existing destination file name, 104 * create a new file */ 105 (void)unlink(to.p_path); 106 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 107 fs->st_mode & ~(S_ISUID | S_ISGID)); 108 } else 109 /* overwrite existing destination file name */ 110 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 111 } else 112 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 113 fs->st_mode & ~(S_ISUID | S_ISGID)); 114 115 if (to_fd == -1) { 116 warn("%s", to.p_path); 117 (void)close(from_fd); 118 return (1);; 119 } 120 121 rval = 0; 122 123 /* 124 * Mmap and write if less than 8M (the limit is so we don't totally 125 * trash memory on big files. This is really a minor hack, but it 126 * wins some CPU back. 127 */ 128 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 129 if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) { 130 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 131 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 132 warn("%s", entp->fts_path); 133 rval = 1; 134 } else { 135 for (bufp = p, wresid = fs->st_size; ; 136 bufp += wcount, wresid -= wcount) { 137 wcount = write(to_fd, bufp, wresid); 138 if (wcount >= wresid || wcount <= 0) 139 break; 140 } 141 if (wcount != wresid) { 142 warn("%s", to.p_path); 143 rval = 1; 144 } 145 /* Some systems don't unmap on close(2). */ 146 if (munmap(p, fs->st_size) < 0) { 147 warn("%s", entp->fts_path); 148 rval = 1; 149 } 150 } 151 } else 152 #endif 153 { 154 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 155 for (bufp = buf, wresid = rcount; ; 156 bufp += wcount, wresid -= wcount) { 157 wcount = write(to_fd, bufp, wresid); 158 if (wcount >= wresid || wcount <= 0) 159 break; 160 } 161 if (wcount != wresid) { 162 warn("%s", to.p_path); 163 rval = 1; 164 break; 165 } 166 } 167 if (rcount < 0) { 168 warn("%s", entp->fts_path); 169 rval = 1; 170 } 171 } 172 173 /* 174 * Don't remove the target even after an error. The target might 175 * not be a regular file, or its attributes might be important, 176 * or its contents might be irreplaceable. It would only be safe 177 * to remove it if we created it and its length is 0. 178 */ 179 180 if (pflag && setfile(fs, to_fd)) 181 rval = 1; 182 (void)close(from_fd); 183 if (close(to_fd)) { 184 warn("%s", to.p_path); 185 rval = 1; 186 } 187 return (rval); 188 } 189 190 int 191 copy_link(FTSENT *p, int exists) 192 { 193 int len; 194 char link[PATH_MAX]; 195 196 if ((len = readlink(p->fts_path, link, sizeof(link) - 1)) == -1) { 197 warn("readlink: %s", p->fts_path); 198 return (1); 199 } 200 link[len] = '\0'; 201 if (exists && unlink(to.p_path)) { 202 warn("unlink: %s", to.p_path); 203 return (1); 204 } 205 if (symlink(link, to.p_path)) { 206 warn("symlink: %s", link); 207 return (1); 208 } 209 return (0); 210 } 211 212 int 213 copy_fifo(struct stat *from_stat, int exists) 214 { 215 if (exists && unlink(to.p_path)) { 216 warn("unlink: %s", to.p_path); 217 return (1); 218 } 219 if (mkfifo(to.p_path, from_stat->st_mode)) { 220 warn("mkfifo: %s", to.p_path); 221 return (1); 222 } 223 return (pflag ? setfile(from_stat, 0) : 0); 224 } 225 226 int 227 copy_special(struct stat *from_stat, int exists) 228 { 229 if (exists && unlink(to.p_path)) { 230 warn("unlink: %s", to.p_path); 231 return (1); 232 } 233 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 234 warn("mknod: %s", to.p_path); 235 return (1); 236 } 237 return (pflag ? setfile(from_stat, 0) : 0); 238 } 239 240 #define RETAINBITS \ 241 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 242 243 int 244 setfile(struct stat *fs, int fd) 245 { 246 static struct timeval tv[2]; 247 struct stat ts; 248 int rval; 249 int gotstat; 250 251 rval = 0; 252 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 253 S_IRWXU | S_IRWXG | S_IRWXO; 254 255 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 256 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 257 if (utimes(to.p_path, tv)) { 258 warn("utimes: %s", to.p_path); 259 rval = 1; 260 } 261 if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts)) 262 gotstat = 0; 263 else { 264 gotstat = 1; 265 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 266 S_IRWXU | S_IRWXG | S_IRWXO; 267 } 268 /* 269 * Changing the ownership probably won't succeed, unless we're root 270 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 271 * the mode; current BSD behavior is to remove all setuid bits on 272 * chown. If chown fails, lose setuid/setgid bits. 273 */ 274 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 275 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 276 chown(to.p_path, fs->st_uid, fs->st_gid)) { 277 if (errno != EPERM) { 278 warn("chown: %s", to.p_path); 279 rval = 1; 280 } 281 fs->st_mode &= ~(S_ISUID | S_ISGID); 282 } 283 284 if (!gotstat || fs->st_mode != ts.st_mode) 285 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 286 warn("chmod: %s", to.p_path); 287 rval = 1; 288 } 289 290 if (!gotstat || fs->st_flags != ts.st_flags) 291 if (fd ? 292 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 293 warn("chflags: %s", to.p_path); 294 rval = 1; 295 } 296 297 return (rval); 298 } 299 300 void 301 usage(void) 302 { 303 304 (void)fprintf(stderr, "%s\n%s\n", 305 "usage: cp [-R [-H | -L | -P]] [-f | -i] [-pv] src target", 306 " cp [-R [-H | -L | -P]] [-f | -i] [-pv] src1 ... srcN directory"); 307 exit(EX_USAGE); 308 } 309